單項(xiàng)選擇題Air trapped in the hydraulic fluid of a steering system would be indicated by（）

A.an improper rudder response
B.hammering noises in the equipment or transmission lines
C.popping or sputtering noises
D.all the above


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1.單項(xiàng)選擇題How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic system?（）

A.clean the fittings before they are disconnected
B.Place drip pans under leaky fittings
C.Seal any cracks in lines with Permatex
D.Coat all threads with graphite oil

2.單項(xiàng)選擇題In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid, as this will cause（）

A.molecular fluid vibration
B.energy losses
C.wide pressure variations
D.mechanical damage to control valves

3.單項(xiàng)選擇題One function provided by a hydraulic accumulator is to（）

A.provide an area where air can separate from the oil
B.provide an area to separate solid contaminants from the oil
C.act as an oil and water separator
D.absorb shocks occurring in the system

4.單項(xiàng)選擇題A reservoir, as used in hydraulic systems aboard ship, is used to store hydraulic oilAnother function is to（）

A.act as a shock absorber
B.maintain the stored oil under pressure
C.act as a base or foundation for the power unit
D.eliminate pressure surges in the system

5.單項(xiàng)選擇題To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, you should （）

A.admit only enough fresh outside air to provide proper ventilation
B.reduce the air reheating system load
C.lower the compressor head pressure
D.operate the purge recovery unit continuously